package com.zhigongtech.core.web.jwt.shiro;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

import com.zhigongtech.core.web.jwt.JwtToken;
import com.zhigongtech.core.web.jwt.JwtUtil;
import com.zhigongtech.extension.entry.vo.AccountVo;
import com.zhigongtech.tender.sys.entity.User;
import com.zhigongtech.tender.sys.service.IUserService;

@Component
public class MyRealm extends AuthorizingRealm  {

	 
    @Autowired
    @Lazy
    private IUserService userService;
	
    /**
     * 必须重写此方法，不然Shiro会报错
     */
    @Override
    public boolean supports(AuthenticationToken token) {
        return token instanceof JwtToken;
    }
 
    /**
     * 只有当需要检测用户权限的时候才会调用此方法，例如checkRole,checkPermission之类的
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
    	SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
        String username = JwtUtil.getAccount(principals.toString());
        //根据用户名查询权限
        AccountVo vo = userService.getOneByAccount(username);
        simpleAuthorizationInfo.addStringPermissions(vo.getPermissions());
        return simpleAuthorizationInfo;
    }
 
    /**
     * 默认使用此方法进行用户名正确与否验证，错误抛出异常即可。
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken auth) throws AuthenticationException {
        String token = (String) auth.getCredentials();
        // 解密获得username，用于和数据库进行对比
        String username = JwtUtil.getAccount(token);
        if (username == null) {
            throw new AuthenticationException("token无效");
        }
 
        User userBean = userService.getUserByAccount(username);
        if (userBean == null) {
            throw new AuthenticationException("用户不存在!");
        }
 
        if (!JwtUtil.verify(token, username, userBean.getPassword())) {
            throw new AuthenticationException("用户名或密码错误,或者token过期。");
        }
 
        return new SimpleAuthenticationInfo(token, token, "my_realm");
    }
}
